Blast-furnace.



'No. 836,801. A PATENTED NOV. 27, 1906. J. GOYNE. BLAST FURNACE,

APPLIOATION FILED DEG. 22, 1904. I

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J. OOYNE.

BLAST FURNACE. APPLICATION FILED DEC. 22, 1904.

PATBNTBD NOV. 27, 1906.

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INVENTOR I P w QCJ M LAtty's JOHN COYNE, OF WILKINSBURG, PENNSYLVANIA.

BLAST-FURNACE.

Specification of Letters Patent.

Patented Nov. 27, 1 906.

Application filed December 22, 1904. Serial No. 237,986.

T0 aZZ whom, it may concern.-

Be it known that 1, JOHN COYNE, a citizen of the United States, residingat Wilkinsburg, in the county of Allegheny and State of Pennsylvania,have invented or discovered certain new and useful Improvements inBlast-Furnaces, of which improvements the following is a specification.

The invention described herein relates to certain improvements inblast-furnaces, and has for its object the provision of suitable meanswhereby dust, &c., can be removed from the combustible gases on theirpassage to the point or points of use.

It is a further object of the invention to prevent the effects due tothe explosion of gases in the furnace from extending into and throughthe down-comer pipes, and thereby preventing the carrying of dust, &c.,into the hot-blast stoves, boiler, furnaces, &c.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings, forming a part of this specification,Figure 1 is a view, partly in section and partly in side elevation, ofthe blast-furnaces having my improvements applied thereto. Fig. 2 is aview, partly in plan and partly in section, of the furnace; and Fig. 3is a large sectional view of the upper portion of the furnace and themechanism employed for controlling the flow of gases to the down-comerpipe.

In Letters Patent No. 777,498, dated December 13, 1904, I have describedand claimed certain improvements in blast-fun naces, consisting,generally stated, in the provision of an explosion-chamber incommunication with the upper portion of the blast-furnace and meanswhereby the dust, &c., may be removed from the gases generated on anexplosion in the furnace before such gases are permitted to pass intothe atmospherev In order to prevent the gases generated on the explosionin the furnace from passing into the down-comer pipes and also for thepurpose of removing dust, &c., from the gases in their passage duringthe normal operation of the furnace to and through the down-comer pipes,gas-exit pipes 1 are connected, as usual, to the upper portion of thefurnace and at their outer ends to a receiving-chamber 2. This chamberis connected, preferably, by a straight vertical pipe 3 to a dustremoving and collecting chamber 4. The pipe 3 extends down into thechamber 4 beyond the point ofconnecmit of the separation of theparticles of dust,

&c., therefrom. Water is placed in the chamber 4, so that its surfacewill be a short distance below the lower end of the dis charge-pipe 3,thus affording a space for the passage of the gases between the end ofthe pipe and the surface of the water. As the gases change direction asthey leave the pipe 3, and as the particles of dust, &c., are heavierthan the gases, the direction of movement of these particles will not bechanged as rapidly and they will therefore come into contact with thewater and be taken up thereby, while the gases without contact with thewater, at least to any considerable extent, will pass on through thedown-comer pipe.

In order to prevent the gases generated on the explosion in the furnacefrom entering the chamber 4, a suitable valve mechanism is employedwhich will stand open during the usual normal operation of the furnace,but will be closed on the sudden increase of pressure in the furnace,thereby preventing a flow of gases to a chamber 4 until normalconditions are reestablished. A suitable construction to this endconsists of a valve 6 so pivoted within the chamber 2 that when shifted,as hereinafter described, it will cover the upper end of the pipe 3.This valve is adapted to be held normally open by any suitable means-as,for example, a weight 7. In order to close the valve, a stem 8,connected thereto, extends into a cylinder 9, supported by the Walls offurnace, and is connected to a piston 10 in said cylinder, the inner endof the latter being opened to permit the free access of pressure againstthe piston. On sudden increase of pressure the piston is shiftedoutwardly, closing the valve, and thereby preventing any further passageof gases into chamber 4 until the normal conditions are established,when the valve will be opened by the weight 7. In case of an explosionof gases in the furnace the valve 6 is closed, as stated, and the gasesgenerated on such explosion escape through openings 12, which are closedduring the usual or normal operation of the furnace by valves 13. Thesevalves are adapted to be opened by an abnormal increase of pressure inthe furnace and permit the gases, &c., to flow into theexplosion-chamber 14, where provision is IIO made as described inLetters Patent No.

777,498, dated December 13, 1904, for the separation of solid particlesfrom the gases, the retention of the solid particles, and the freeescape of the gases.

In order to remove the solid particles collected in the chamber 4, thelatter is connected by a pipe 11 to a collector similar to that shown inthe Letters Patent referred to.

I claim herein as my invention 1. A blast-furnace having in-combinationa down-comer pipe, a normally open valve, means operative by pressure inthe furnace for closing said valve, and outlets from the furnace havingnormally closed valves and adapted to be opened by abnormal increase ofpressure in the furnace, substantially as set forth.

i 2. A blast-furnace having in combination a down-comer pipe, a normallyopen valve,

means operative by pressure in the furnace for closing said valve, and anormally closed explosion-chamber connected to the furnace,

substantially as set forth.

normally preventing the flow of gas through the explosion-chamber andadapted to be shifted on an abnormal increase of pressure to permit thegas to flow through the chamber, substantially as set forth.

In testimony whereof I have hereunto set my hand.

I JOHN COYNE. Witnesses:

CHARLES BARNETT, FRED KIROHNER.

